Work holder for band-sawing



April 29, 1952 c. F. BARTO 2,594,277

WORK HOLDER FOR BAND-SAWING Filed Jan. 16, 1948 2 SHEETSSHEET 1 In venfor- Charles FBarzo,

April 29, 1952 c. F. BAR-TO 2,594,277

WORK HOLDER FOR BAND-SAWING Filed Jan. 16, 1948 2 SHEETS--SHEET 2 22 z55 N A 5% N v A, 27 Z [nvenzor Charles FBarzo by s neg Patentecl Apr.29, 1952 WORK HOLDER FOR BAND-SAWING Charles F. Barto, Rochester, N. Y.,assignor to United Last Company, Boston, Mass, a corporation of MaineApplication January 16, 1948, Serial No. 2,608

The purpose of the present invention is to provide improved means forholding a last and constraining its presentation to a band-saw for thepurpose of dividing it in such a way as to form a hinge of the typeillustrated in United States Letters Patent No. 1,513,743, grantedNovember 4, 1924, on application of George Clausing.

The novel features of the invention are predicated upon a sequence ofoperations that differs in one respect from that set forth in the patentabove mentioned, namely, a sequence in which the hinge-forming cut isthe final cut by which a last is divided into separable parts, forepartand heel part. The reason for making all the other necessary dividingcuts prior to the hingeforming cut is to avoid having to impart reverserotation to a last to free it from the band-saw after the latter hasformed a hinge.

A work-holder for the purpose specified is provided with two upstandingjig-pins on which a last may be impaled, a last of the type underconsideration having twoparallel pin-receiving holes extendingwidthwise, one through the forepart and the other through the heel part.One of the improvements in a work-holder embodying this invention isprovided by making the holder in two relatively movable sections eachcarrying one of the jig-pins, the sections being so connected, otherwisethan by a last, that after they have served conjointly to control thehingeforming operation one of the jig-pins may be moved sidewise awayfrom the other as soon as severance of the last is completed, and thuscaused to carry the correspondin last-part away from the band-saw to alocality where it may be stripped from its jig-pin without danger to theoperator, the last and the band-saw.

The invention also provides means for carrying the work-holder bodilytoward and from the band-saw, the carrying means being constrained to apath parallel with the plane of the saw, and therefore capable ofretracting the work-holder and both parts of a severed last from the sawwithout danger of fouling the latter.

Referring to the drawings,

Fig. 1 represents a top plan View of the table of a band-sawing machineequipped with apparatus embodying the present invention, the parts beingin their initial positions;

Fig. 2 represents the position to which the work-holder will be moved toplace a last in the desired relation to the band-saw for the beginningof the hinge-forming operation, the work- 5 Claims. (01. 143-171)presenting carriage being omitted but the bandsaw being represented inthe crotch of the last;

Fig. 3 is a plan view similar to Fig. 1 but representing thework-presenting carriage in its advanced position and the work-holder inthe position corresponding to completion of the hingeforming operation;

Fig. 4 represents a sectional view of portions of the saw-table, thework-presenting carriage and the work-holder indicated by line IV-IV inFig. 2; and

Fig. 5 represents the work-holder as provided with a spring arranged toretract one of the ji pins away from the other.

A last of the type under consideration is turned in one piece includinga forepart l0 and a heel part H. After its surfaces have been shaped andfinished two holes 16 and I! are bored through it from side to side, anda wedgeshaped piece is cut out of its cone portion leaving a deep recessI2 above the portion that is to be thereafter sawed with a band-saw toform a hinge (Fig. 3) comprising a semi-cylindrical knuckle I3 on onepart and a correspondingly shaped recess M in the other. If the presentinvention is to be utilized a kerf l5 must be out before the hinge isformed, this kerf being below the hinge-forming portion and its deepestpart being arranged to be intersected by the terminal part of thehinge-forming cut.

The holes l6 and I! are parallel and located one near the rear of theforepart and the other near the front of the heel part. They are locatedwith regard to the desired location of the hinge, and are spaced onefrom the other according to the length of a link (not shown) by whichthe forepart and heel part will finally be connected. While the last isin process of manufacture the holes l6 and I! are utilized to mount iton one pair of jig-pins when cutting the recess [2, on another pair whencutting the kerf l5, and on still another pair when cutting the knucklel3 and recess M of the hinge.

The jig-pins l8 and I9 of the hinge-forming pair are shown in Figs. 4and 5 without a last, but in Figs. 1, 2 and 3 they occupy the holes l6and [1 respectively. These jig-pins are parts of relatively movableinterconnected sections 20 and 2| of a work-holder and are parallel withthe axis of a pivot-pin 22 that may be afiixed to the section 2|, or toa work-presenting carriage 23, as preferred. In either event, thecarriage will constitute a support on which the work-holder may lie andto which it will be connected by the pivot-pin 22 and therebyconstrained to angular movement. If the pin 22 is aflixed to the section2| it will turn in a bearing in the carriage, but if affi-xed to thelatter the bearing will be in the section 2|.

The reason for making the work-holder in two sections is to enable thejig-pin E3 to move away from the pin l9 as, soon as the connectionafforded by a last is severed. The severance of this connection enablesthe pin It to carry the corresponding part of the last out of the planeof the band-saw 24. The sections 20 and 2| are otherwise connectedpreferably by a hinge comprising lapped ear portions and a pivot pin 25,and the jig-pins are located at opposite sides of a line intersectinboth pivot pins. When the work-holder is arranged upon its support, asshown, it may be swung about the axis of the pivot pin 22, first toplace a last carried by the jig-pins in the desired position (Fig. 2) tobegin a hinged-forming operation, and thereafter to feed the last to theband-saw.

The carriage23 is arranged to slide on a track comprising a pair ofrails 26 aiiixed to a saw-table 21 and is thereby guided along a pathparallel with the plane of the band-saw-M, that plane being indicated inFig. 1 by a dotted line 28. -A screw 29 carried by the carriage 23 isarranged to abut a stop 36) to arrest the carriage at a station where itwill place the pivot 22 in the desired relation to the band-saw (Fig. 3)for the hingeforming operation. The carriage 23 is provided with athroat 3 I, and thework-holder is provided with a throat 32, botharranged to provide clearance for the saw.

The procedure for utilizing the invention is as follows: Whenthecarriage 23 is retracted from the. saw 24, as in Fig. 1, a last maybe impaled on the jig-pins l6 and I1 without danger of fouling the saw.If the knuckle [3 of the hinge is to' be formed on the heel part, ratherthan on the forepart, the forepart must be placed on the pin I6 and theheel part on the pin ll. When this has been done the carriage 23 may bemoved toward the saw until arrested by the stop 30, but during thelatter stages of this travel the operator will turn the lastcounterclockwise about the axis of the pivot. 22 to avoid fouling thesaw with the forepart It). The last will thus be located with respect tothe saw as represented in Fig. 2, the toothed edge of the saw beingtoward the forepart.

Now, without moving the carriage 23, the operator will turn the, lastabout 180 in a clockwise direction about the axis of the pivot 22,thereby feeding the last to the position represented by solid lines inFig. 3 and causing the saw to form the-knuckle l3 and the recess I4.When the saw intersects the kerf l5 the severance of the last iscomplete, and the forepart I is free to be shifted to the left (see dashline) of the plane of the saw and to take the section 20 (see dottedline) with it. At this, stage the section 20 will swing counterclockwiseabout the pivotal center of the pin 25, and since no part of the last orwork-holder will lie behind the saw the carriage 23 may be retractedbefore either part of the last is stripped from its jig-pin.

Fig. illustrates the work-holder as provided with a leaf-spring 33arranged to retract the section 20 from the position indicated by abroken line to that indicated by a solid line. The ends of the springare bent to form hooks or eyes and they are interengaged with tabs 34aflixed to the sections 20 and 2| respectively.

The effect of the spring is to displace the forepart of a last and thesection 20 of the work-holder automatically from the plane of the saw atthe instant when severance of the last is complete, and to resist anyfalse movement that might otherwise cause the section 20 to foul the sawwhile the carriage 23 is being retracted.

It will be understood from the appended claims that they are intended tocover all changes and modifications of the example of the inventionherein chosen for purposes of the disclosure which do not constitutedepartures from the spirit and scope of the invention.

Having described my invention, what I claim as new and desire to secureby Letters Patent of the United States'is:

1. In a sawing machine, a power actuated saw-blade, a support movabletoward and from the saw-blade, a work-holder cooperatively related tothe saw-blade and comprising two generally coplanar sections, a pivotconnecting one of said sections with the support, said sections beingdisposed in a plane angularly related to that of the saw-blade, a secondpivot spaced from the firstand connecting the sections for angularmovement together and apart in their plane, and toward or from the planeof the saw-blade, and parallel jig-pins extending one from each sectionand spaced to impale a work-piece connecting them, said sections therebybeing swingable about the first-mentioned pivot in unison with thework-piece until the latter is severed by the saw-blade, the sectionsthen being individually swingable about said second pivot to allowseparation of said sections from the saw-blade.

. 2. In a sawing machine, a power actuated sawblade, 9, horizontalsupport movable toward and from the saw-blade, and work-holding meanscomprising two flat sections overlaying the support and interconnectedby a vertical pivot at their adjacent end portions for relative angularmovement, a second vertical pivot by which one of said sections isconnected to the support and said means is mounted for movement in apath angularly related to the plane of the saw-blade, and a verticaljig-pin extending from each section, said jig-pins being approximatelypositioned, whenthe angle between said sections is small, diametricallyopposite from each other with respect to said second pivot jointly toim-- pale a work-piece, the sections being rotatable in unison about thesecond pivot to sever the work-piece by said saw-blade whereupon theindividual sections are angularly movable relative to each other aboutthe first-mentioned pivot to separate the severed work-pieces.

3. A machine for forming cylindrical hinge surfaces comprisingv a poweractuated saw-blade, a support, means for guiding the support toward andfrom the saw-blade in apath parallel with the plane thereof, a workholder comprising two sections, a pivot connecting adjacent portions ofthe sections for relative angular movement in a plane angularly relatedto the plane of operation of the saw-blade, a protruding portion of onesection extending toward the other when in relatively closed angularposition but spaced therefrom to permit cutting movement therebetween ofthe saw-blade, a jig-pin secured in upstanding position in each sectionjointly to impale a work-piece, said jig-pins being arrangedrespectively to engage the work-piece on opposite sides of the cut to besawn, and pivotal means connecting said protruding portion with thesupport and having a turning. axis normal thereto whereby the sectionsand work-piece may be swung together about said axis until completeseverance of the workpiece whereupon the sections are individuallyswingable about said pivot.

4. In a sawing machine, a vertical power actuated saw-blade, ahorizontal support movable toward and from the saw-blade in a pathparallel with the plane thereof, the support having a throat toaccommodate the saw-blade, a worksupport comprising two sections havingoverlapping portions, a vertical pivot connecting the portions forrelative angular movement of the sections and movement toward and fromthe plane of the saw, means for limiting the pivotal closing movement ofthe sections to assure clearance for the saw-blade, a second verticalpivot spaced from the first and from the plane of the saw and connectingone of the sections with the support, and a vertical jig-pin extendingupward from each section, the jig-pins being respectively located atopposite sides of a line intersecting both pivots, said jig-pins beingarranged to impale a work-piece for swinging it 6 about the second pivottogether with the sections until severed by the saw-blade, the sectionsthen being independently swingable about the first pivot to separate thesevered work-pieces.

5. In a sawing machine the combination as set forth in claim 4 furthercharacterized in that a spring is connected to said sections to urgethem angularly apart and away from the saw.

CHARLES F. BARTO.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 236,075 Parks et a1 Dec. 28, 18801,513,743 Clausing Nov. 4, 1924 2,394,789 Lavoie Feb. 12, 1946 FOREIGNPATENTS Number Country Date 479,527 Germany July 18, 1929

